Near 100% Diffraction Efficiency and High Net-gain in a Photorefractive Polymer
Photorefractive (PR) polymers are new materials1-4 with many potential photonic applications, including dynamic holographic storage and image processing. They offer structural flexibility, ease of processing, a superior figure of merit compared with commonly used inorganic crystals, and low cost. We have developed a photorefractive polymer composite with significantly enhanced diffraction efficiency and two-beam-coupling gain.5 For the first time, near complete diffraction of an incident beam can be observed in a 105-μm thin photorefractive polymer film using a low-power laser diode. The material also exhibits a net two-beam coupling gain of more than 200 cm-1.
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